or solve online (using our beta test of Penpa-Edit tools; use Tab key to alternate between line drawing and shading)
Theme: 1, 2, 3
Author/Opus: This is the 74th puzzle from our contributing puzzlemaster Serkan Yürekli.
Rules: Variation of Nurikabe. Shade some empty cells black so that the grid is divided into white areas, each containing at most one number. A white area with a number must have the same area in cells as that number. White areas may only touch diagonally. All shaded cells must be connected with each other, but no 2×2 group of cells can be entirely shaded. Also, all shaded cells must be divisible into snakes with the heads and tails given in the grid. Snakes cannot cross each other.
Also, see this example:
Answer String: Enter the length in cells of each of the black segments from left to right for the marked rows, starting at the top. Separate each row’s entry with a comma. This example has the key “7,32,31”.
Time Standards (highlight to view): Grandmaster = 2:15, Master = 3:15, Expert = 6:30